Rename Der Alltagsstift back to Der Eine., move route to /der-eine

New copy throughout (hero, "Was kann er?", the "Warum Der Eine.?" brand-story
section replacing the old phone-vs-pen scenario grid, final CTA) plus the
Payload product's name/detailHref updated to match (done directly via psql,
no Payload admin API key available — see reference_payload_direct_db_access).

app/components/Navbar.tsx

@@ -60,7 +60,10 @@ function getNavLinks(singleActiveProduct: boolean) {
 // mark "Werkzeuge" active in the nav for the same reason — confirmed by
 // page-weekly-impulses's own breadcrumb ("Startseite › Werkzeuge ›
 // Impulse & Tipps") and active-underline position, same as page-todo-karten's.
-const WERKZEUGE_ROUTES = ["/todo-cards", "/lebensuhr", "/newsletter"];
+// /der-eine and /tasse-die-pause (both bespoke product detail pages, same
+// "own route, not nested" shape as /todo-cards) added here for the same
+// reason (2026-08-25).
+const WERKZEUGE_ROUTES = ["/todo-cards", "/lebensuhr", "/newsletter", "/der-eine", "/tasse-die-pause"];
 
 function isNavLinkActive(href: string, pathname: string, activeSection: string): boolean {
   if (href === "#werkzeuge") {